Carbureter.



M. DUVALL.

CARBURETER.

APPmcmmu man ma. 3l. 191e.

Patented Mar. 27, 1917.

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MARIUS DUVALL, OF GOLDFIELD, NEVADA.

CARBURETER.

Specification of Letters Patent.

Patented Mar. 2% 19317..

Application filed March 31. 191'6. Serial No. 822065.

To all w'mm 'it may concern:

Be itlino'ivn that T, Marins Dovanri, a citizen of the United Statesq residing at Goldiicld, in the county of llsmeralda and State of Nevada, have invented new and useful improvements in Carburetor-s, of which the following is a sl'iecification.

This invention relates to an improvement in carliuireters for internal combustion en- `eines.

Its principal object is to provide a earburcter of an exceedingly simple construction wherein adequate provision is made for aecurately proportioning the constituents ofv the fuel mixture for any quantum delivered by the carliureter and for accurately adapting the quantum of Athe fuel mixture to the speed of the engine.

The invention consists in `certain detail features of structure and combi nation which7 together with the above and other An embodiment. of the invention is illus trated in the accompanying drawing, wherein Figure l is a vertical centml section of a carbureter in which the features of the in vention are incorporated; andl llig. 2 is an enlarged detail seetionalyiew on the line Q-Q of Fig, l.

Similar characters of reference designate corresponding parts in both of the views.

The carbureter consists of a carburetinp; chamber l which is arranged above and axially alines and communicates with an air pipe 2 open to the atmosphere at its lower end. The fuel pipe 3 is set eo-axially within the pipe 2 and has at its upper end a spray inn` nozzle t which alines axially with the chamber l. Adjacent the nozzle lthe pipe 2 is formed with a Venti'iri-type choke rib I' which provides a reduced, relatively narrow air throat-way (3l concentric to the nozzle 4. The latter has at its apex a constantly open 'fuel discharge bore 7 and suitably below its apex a series of laterally directed fuel discharge openings 8 which arepreferably helically arranged. f

The chamber l is. as usual, in line with the motor suction tube 9 to which the carber and also ofthe quantum of the mixtureA a relatively close surrounding fit jen thefuel 'pipe and Is movable lengthwise of aid pipe. The valve 10 has at its upper end a circumscribing` flange ll which functions as an air valve and controls the efficient size of the air tl'iroat-way concentric. to the pipe 3 and provided by the pipe 2. The width of the flange ll is selected whereby when the sleeve l() is in its uppermost position said flange will completely close the 'throat-way 6. ln such a casey communication will be had between the chamber l and the pipe 2 by means of openings l2 formed in the flange ll and of which a suitable number are provided.

rlhe openings 8 arranged below the reduced throat-way o and the sleeve l() has upward movement to diminish the number of openings 8 which participate in the discharge of fuelfroin the fuel pipe 3 and has downward Vmovement to increase the number of such openings S.

The carbureter is equipped with the usual f butterfly throttle valve lf3 which is arranged near the upper end of the mixing,r chaniber. Preferably, the operations of the valve l() are correlated to the operations of "the throttle valve 13, and for this purpose,

the valve l() is provided with an upright bail lslwhich is connected by a link l5 to the valve lf in such manner that as the valve 13 is opened the valve l0 is moved down ward, and as the valve 13 is closed, the valve l() is raised.l

The drawings show the throttle valve i3 closed and the valve l() in its uppern'iost position. In such position of the valveli'), the opei'iiugs S are entirely -covcred and the throatovav G is closed. communiration being' provided between the mixing chamber i and the pipe 2 by the openings l2. The object of the provision of the single constantly open fuel discharge bore 7 and of the constantly open air passagesI l2 is to enable the engine to be run at low or throttling speed and, therefore, the throttle valve will have a certain very limited initial range of opening movement during which the sleeve 10 will not urn-over the openings S and the flange ll will not open the throat-way 6. "When the throttle valve lis thus very Slightly opened, the engine may be run at its lowest or throttling speed.

The mixing of the fuel is obviously pro- -Inoted by the provision I the choke rib 5.

\ As a further ald in eifectinga good mixture of the air1 and gas, it is preferred lto provide the pipe 3 with a helical rib 16 which extends toward the face of the pipe 2 and by which the air induced through the pipe 2 is given a whirling motion'as it passes into the mixing chamber 1.

The fuel pipe 3 leads 'from a iioat feed chamber, as usual, and this chamber, indicated at '17, vis preferably concentric to the pipe 2 and is removably secured to the upper casting of the carbureter with which the chamber 1 and thefpipe 2 are formed. The chamber 1 is 'preferably jacketed, as at 18, andthe iioat feed ghamber 17 is secured to the base of the jacket 18 by bolted flange connections 19 and has its bottom provided fao with an opening 20 through which the lower end ofthe pipe 2 projects.

I claim- 1. In a carbureter, in combination, a carhaving near its upper end laterally directed .fuel discharge openings, the air pipe have ing a Venturi-type choke rib adjacent said spraying nozzle, and a valve 'concentric to the fuel pipe ,and slidable lengthwise thereof to .control the said openings of the fuel pipe, the valve having a ange to control the air passage between` said air pipe and said fuel pipe.

2. In a carbureter, in combination, a carbureting chamber, an air pipe open to the lower end of said chamber, a fuel pipe arranged co-axially within the air pipe and having itsupper end formed as a spraying nozvleand provided with a plurality of laterally directed openings, the air pipe having a Venturi-type choke rib adjacent said spraying nozzle, and a sleeve valve slidably surrounding the fuel pipe to control `the openings of the spraying nozzle, the valve having at its upper end a circumseribing Bange to control the air passage between said air pipe and said fuel pipe.

3. In a carbureter, in combination, a carbureting chamber, an air pipe open to the lower end nf said chamber, a fuel pipe arranged co-'axially within the air pipe and having its upper end formed-as a spraying nozzle and provided with laterally directed openings and with an axial bore, and a valve concentric to the fuel pipe and slidable lengthwise' thereof to control said laterally directed openings, the valve having a iiange to control the air passage between said air tube and said fuel pipe.

4. In a carbureter, in combination, a carbureting chamber, an Vair pipe open to the lower end of said chamber, a fuel pipe arranged co-axially within the air pipe and having its upper end formed as a spraying nozzle and provided with laterally directed openings and with an axial bore, and a sleeve valve slidably surrounding the fuel pipe to control the openings of the spraying nozzle, the valve having at its upper end a circurnscribing fiange to control the air passage between said air pipe and said fuel pipe.

5. In a carbureter, in combination, a carbureting chamber, an air tube open to the lower end of said y chamber, a fuel pipe arranged co-axially within the air tube. and having-near its upper end laterally directed fuel discharge openings, and a sleeve valve slidably surrounding the fuel pipe to control the said openings of the fuel pipo, said valve being provided with a circun'iscribing iange controlling the air passage between said air tube and said fuel pipe.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

MAR-IUS DU VALL.

Witnesses:

T. W. Kumi/xm., J osari-I J. VVEILnr. 

